body {
  margin: 0;
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #333;
}

ul {
  padding: 0;
  list-style-type: none;
}

li {
  color: orange;
  font-size: 25px;
  width: 8em;
  height: 2em;
  border-left: 0.08em solid;
  position: relative;
  margin-top: 0.8em;
  cursor: pointer;
  /* border: 2px solid red; */
}

li::before,
li::after {
  content: "";
  position: absolute;
  width: inherit;
  border-left: inherit;
  z-index: -1;
}

li::before {
  height: 80%;
  top: 10%;
  left: calc(-0.15em - 0.08em * 2);
  filter: brightness(0.8);
}

li::after {
  height: 60%;
  top: 20%;
  left: calc(-0.15em * 2 - 0.08em * 3);
  filter: brightness(0.6);
}

li span {
  position: relative;
  height: 120%;
  top: -10%;
  box-sizing: border-box;
  border: 0.08em solid;
  background-color: #333;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: sans-serif;
  text-transform: capitalize;
  transform: translateX(calc(-0.15em * 3 - 0.08em * 2));
  transition: 0.3s;

  /* border: 5px solid orange; */
}

/* li::before, li::after position are both absolute */
/* so li::before and li::after are absolute to relative of li span */
/* as li span set background-color: #333, it would cover li::before, li::after  */
/* li element set width, but but didn't set border top bottom and right.
so li span element cover the whole li, li:before and li:after */

/* li span border: 0.08em solid define the li border as well */

li:hover span {
  transform: translateX(0.15em);
}